Journal cover Journal topic
Climate of the Past An interactive open-access journal of the European Geosciences Union
Clim. Past, 13, 1451-1471, 2017
https://doi.org/10.5194/cp-13-1451-2017
© Author(s) 2017. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
02 Nov 2017
Climate signals in a multispecies tree-ring network from central and southern Italy and reconstruction of the late summer temperatures since the early 1700s
Giovanni Leonelli1, Anna Coppola2, Maria Cristina Salvatore2, Carlo Baroni2,3, Giovanna Battipaglia4,5, Tiziana Gentilesca6, Francesco Ripullone6, Marco Borghetti6, Emanuele Conte7, Roberto Tognetti8, Marco Marchetti7, Fabio Lombardi9, Michele Brunetti10, Maurizio Maugeri10,11, Manuela Pelfini12, Paolo Cherubini13, Antonello Provenzale3, and Valter Maggi1,3 1Dept. of Earth and Environmental Science, Università degli Studi di Milano–Bicocca, Milan, Italy
2Dept. of Earth Sciences, Università degli Studi di Pisa, Pisa, Italy
3Istituto di Geoscienze e Georisorse, Consiglio Nazionale delle Ricerche, Pisa, Italy
4Dept. DiSTABiF, Università degli Studi della Campania “L. Vanvitelli”, Caserta, Italy
5PALECO EPHE, University of Montpellier 2, Montpellier, France
6School of Agricultural, Forestry, Food and Environmental Sciences, Università degli Studi della Basilicata, Potenza, Italy
7Dept. of Biosciences and Territory, Università degli Studi del Molise, Campobasso, Italy
8Dept. of Agricultural, Environmental and Food Sciences, Università degli Studi del Molise, Campobasso, Italy
9Dept. of Agronomy, Università Mediterranea di Reggio Calabria, Reggio Calabria, Italy
10Istituto di Scienze dell'Atmosfera e del Clima, Consiglio Nazionale delle Ricerche, Bologna, Italy
11Dept. of Environmental Science and Policy, Università degli Studi di Milano, Milan, Italy
12Dept. of Earth Sciences, Università degli Studi di Milano, Milan, Italy
13Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Birmensdorf, Switzerland
Abstract. A first assessment of the main climatic drivers that modulate the tree-ring width (RW) and maximum latewood density (MXD) along the Italian Peninsula and northeastern Sicily was performed using 27 forest sites, which include conifers (RW and MXD) and broadleaves (only RW). Tree-ring data were compared using the correlation analysis of the monthly and seasonal variables of temperature, precipitation and standardized precipitation index (SPI, used to characterize meteorological droughts) against each species-specific site chronology and against the highly sensitive to climate (HSTC) chronologies (based on selected indexed individual series). We find that climate signals in conifer MXD are stronger and more stable over time than those in conifer and broadleaf RW. In particular, conifer MXD variability is directly influenced by the late summer (August, September) temperature and is inversely influenced by the summer precipitation and droughts (SPI at a timescale of 3 months). The MXD sensitivity to August–September (AS) temperature and to summer drought is mainly driven by the latitudinal gradient of summer precipitation amounts, with sites in the northern Apennines showing stronger climate signals than sites in the south. Conifer RW is influenced by the temperature and drought of the previous summer, whereas broadleaf RW is more influenced by summer precipitation and drought of the current growing season. The reconstruction of the late summer temperatures for the Italian Peninsula for the past 300 years, based on the HSTC chronology of conifer MXD, shows a stable model performance that underlines periods of climatic cooling (and likely also wetter conditions) in 1699, 1740, 1814, 1914 and 1938, and follows well the variability of the instrumental record and of other tree-ring-based reconstructions in the region. Considering a 20-year low-pass-filtered series, the reconstructed temperature record consistently deviates < 1 °C from the instrumental record. This divergence may also be due to the precipitation patterns and drought stresses that influence the tree-ring MXD at our study sites. The reconstructed late summer temperature variability is also linked to summer drought conditions and it is valid for the west–east oriented region including Sardinia, Sicily, the Italian Peninsula and the western Balkan area along the Adriatic coast.

Citation: Leonelli, G., Coppola, A., Salvatore, M. C., Baroni, C., Battipaglia, G., Gentilesca, T., Ripullone, F., Borghetti, M., Conte, E., Tognetti, R., Marchetti, M., Lombardi, F., Brunetti, M., Maugeri, M., Pelfini, M., Cherubini, P., Provenzale, A., and Maggi, V.: Climate signals in a multispecies tree-ring network from central and southern Italy and reconstruction of the late summer temperatures since the early 1700s, Clim. Past, 13, 1451-1471, https://doi.org/10.5194/cp-13-1451-2017, 2017.
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Short summary
We analyze a tree-ring network from several sites distributed along the Italian Peninsula with the aims of detecting common climate drivers of tree growth and of reconstructing the past climate. We detect the main climatic drivers modulating tree-ring width (RW) and tree-ring maximum latewood density (MXD) and we reconstruct late summer temperatures since the early 1700s using a MXD chronology: this reconstruction is representative of a wide area around the Italian Peninsula.
We analyze a tree-ring network from several sites distributed along the Italian Peninsula with...
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